The Riau Rupiah is a currency used in the Indonesian province of Riau. While this currency may not be familiar to those outside of Riau, there are several synonyms that can be used to refer to it. One common synonym is the Indonesian Rupiah, which is the national currency of Indonesia. Additionally, some may refer to the Riau Rupiah simply as the Rupiah or the IDR (Indonesian Rupiah). While the name of the currency may vary, its value is recognized throughout Indonesia and is the main means of exchange within the province of Riau.